Turning-lathe



(No Model.)

G. S. ROBERTS.

TURNING LATHE.

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GEORGE SMITH ROBERTS, OF MEREDITH, NFAV HAMPSHIRE.

TURNING-LATHE.

SPECIFICATION forming part of Letters Patent No. 306,525, dated October 1e, 1884.

Application filed September 17, 1383. No model.)

To all whom it may concern Be it known that I, GEORGE S. BoBER'rs, a citizen of the United States, residing in Mercdith, in the county of Belknap and State of New Hampshire, have invented a new and useful improvement in lathes for turning (r finishing the faces of iron pulleys, or other work where a curved contour is desired, of which the following is a specification.

To all mill-men the fact is well known that all pulleys (with a few exceptions) on which a belt is to run must be made with the face rounded, or largest in diameter at the center; and the object of my invention is to so govern the motion of the turning-tool or tool-post in aturniing-lathe that it may traverse a curved line, thereby giving the desired form in turn ing a pulley, or where convex surfaces are re quired. I attain this object by the use of a sweep connected with the tool post or carriage, as illustrated in the accompanying drawings. The sweep may be applied to the front or bad: side of a lathe-preferably I have adapted mine to the latter arrangement, as shown in Figure 3, which gives a view of the sweep applied to the lathe, the latter being partly shown in rear elevation.

Fig. l is a view of the sweep independently. Fig. 2 is a vertical crosssee-tion of a lathe with the sweep applied to the back.

Similar letters rcferto similar parts throughout the several views.

In the lathe a, pulley A, tool K, and feedserew H, as shown, are embodied a construction. and method of operation now in common use, which I do not claim as my invention.

In Fig. 2 the tool. post or carriage a is supported and held in position on the feed-screw H, on which it may travel backward and for ward, the back side or extension of the toolcarriage a, being left free to receive the required lateral motion, the screw H acting as a pivot or center of motion. By this arrange ment a corresponding lateral motion will be conveyed to the tool K, causing it to approach or recede from the center of the pulley A as the back end of the tool-earriage a is do pressed or elevated. To this back end or extension of the tool-carriage I have applied a sweep-rod, f, swinging on the center screw, (1,

and held in position by lugs and set-screws B, and provided with lever, t, at the top, on which a weight, 0, is placed, Figs. l and 3. The lug-plate B turns on the bed-plate G, and may be adjusted at any desired point on the sweep-carriage J, thereby giving any desired length of sweep-rod f from the extension a to the center screw, 0. The extension to is held in the saddle on the end of the sweep rod f by the level-i and weight 0; or any other device may be adopted whereby a universal joint may be secured. The sweep-carriage J" is made to rest on a track, E, and is held firmly at any desired point on the said track E by a clamp, D.

In the operation of the pulley-sweep the tool-carriage a should be adjusted to a point on the feed-screw H where the tool K may stand opposite to the center of the pulley A to be turned, or where the largest diameter thereof is desired; and then the sweep should be adjusted to a perpendicular position by sliding the sweep-carriage J on the track E to the desired point, where it should be firmly clamped by the clamp D. As the tool-carriage is caused to move on the feed-screw H, the back end or extension, a, will move in a curve, as indicated by the dotted line 9 g in Fig. 3, under the guidance of the sweep f, thereby causing the tool K to move to and from the center of the pulley in a corresponding curve, the said tool K traversing a curved line in its movements on the work. The curv ature of the line may be. varied by adjusting the center screw, 0, to a higher or lower p0sition on the rod f and sweep-carriage J.

By arranging the sweep to hang from above the tool-carriage a a concave surface may be formed.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In combination with the pivoted tool-carriage and tool of a turning-lathe and means for feeding along the tool-carriage, a sweep, f, mounted 011 the frame or a stationary part of the lathe, connected with the tool-carriage, and adapted to receive a lateral motion in acurved path by the movement of the tool-carriage, and thereby to cause the tool-carriage to move in a curved line more or less distant from the axis of the article being turned, sub stantiz 11y as and for the purpose herein specified.

' 2. In combination with the tooLcarriage and tool of a turning-lathe and screw for feeding along the tool-carriage, a sweep, f, pivoted to a stationary holder connected with the toolcarriage, and adapted to be moved laterally in a curved line by the movement of the toolcarriagc, and thereby to cause the tool to move in a curved line more or less distant from the axis of the-article being turned, substantially as and for the purpose herein specified.

3. In combination with the feed-screwof a turning-lathe and the traveling tool-carriagc pivoted on the said feed screw, a pivoted sweep, f, turning on an adjustable pivot, c,

GEORGE SMITH ROBERTS.

KVitnesses: I

.T. S; ROBINSON, \VILLIs H. ROBINSON. 

